A341193 Number of ways to write n as an ordered sum of 4 nonzero decimal palindromes.

1, 4, 10, 20, 35, 56, 84, 120, 165, 216, 274, 336, 399, 460, 516, 564, 601, 624, 636, 628, 609, 580, 544, 504, 463, 424, 390, 360, 345, 332, 324, 324, 327, 332, 338, 344, 350, 352, 356, 364, 361, 364, 370, 376, 382, 388, 394, 400, 402, 412, 418, 412, 418, 424, 430, 436, 442

Offset: 4

Author

Ilya Gutkovskiy, Feb 06 2021

Keywords

• nonn
• base
• look

Links

• Alois P. Heinz, Table of n, a(n) for n = 4..20000

Crossrefs

Cf. A002113, A136522, A319469, A341157, A341191, A341192.

Programs

Mathematica

nmax = 60; CoefficientList[Series[Sum[Boole[PalindromeQ[k]] x^k, {k, 1, nmax}]^4, {x, 0, nmax}], x] // Drop[#, 4] &